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Alteration, geochemistry, and paragenesis of the Midas epithermal gold-silver deposit, Elko County, Nevada
 

Summary: Alteration, geochemistry, and paragenesis of the Midas
epithermal gold-silver deposit, Elko County, Nevada
E.D. Leavitt* and G.B. Arehart
Department of Geological Sciences, MS-172, University of Nevada, Reno, Reno, Nevada 89557-0138
Leavitt, E.D., and Arehart, G.B., 2005, Alteration, geochemistry, and paragenesis of the Midas epithermal gold-silver deposit, Elko County, Nevada, in
Rhoden, H.N., Steininger, R.C., and Vikre, P.G., eds., Geological Society of Nevada Symposium 2005: Window to the World, Reno, Nevada, May 2005,
p. 563627.
563
SUMMARY
The Ken Snyder mine in the Midas district is located in north-central Nevada
along the eastern margin of the northern Nevada rift. Epithermal precious metal- and
selenium-rich quartz-adularia-calcite veins formed in N- and NW-trending faults at
15.4 Ma, roughly coeval with rhyolitic magmatism. Patterns of alteration reflect
effects of increasing temperature and water:rock reactions towards the Colorado
Grande and Gold Crown veins and with time. Distal weak propylitic alteration (calcite-
chlorite) gives way to moderate propylitic alteration (chlorite-calcite-pyrite-smectite),
and increased wall rock replacement and veining closer to the main veins. An epidote
isograd (first appearance of epidote) forms the contact between moderate and intense
propylitic alteration (chlorite-pyrite-epidote-smectite-albite prehnite adularia).
Haloes of potassic alteration (adularia-chlorite-pyrite/marcasite-smectite/illite-

  

Source: Arehart, Greg B. - Department of Geological Sciences, Mackay School of Mines, University of Nevada, Reno

 

Collections: Geosciences